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BobbyPaulk(at)comcast.net
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 Posted: Mon Aug 25, 2014 5:05 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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Tim,
Where did you get the information about 304 F. Maximum in cruise. I thought it was 356 F max continuous.
I have a 3300 that #5 & #6 cylinders run 310 and 320 F in cruise at 2700 ~ 2800 RPM. I have to pull back to 2450 to get them under
300 degrees.
Am I going to ruin my engine by cruising at 320 F. ??
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 222 hrs.
Do Not Archive
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ftyoder(at)yoderbuilt.com
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| Posted: Mon Aug 25, 2014 6:34 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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Bobby,
I'll see if I can find the source and report. However, If your head bolts are passing the 20# torque test I wouldn't be concerned about the temps. If some of the bolts move I would try to improve the cooling to those heads.
Tim
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of BobbyPaulk(at)comcast.net
Sent: Monday, August 25, 2014 6:05 AM
To: Server, JabiruEngine-List Digest
Subject: Re: JabiruEngine-List Digest: 2 Msgs - 08/23/14
Tim,
Where did you get the information about 304 F. Maximum in cruise. I thought it was 356 F max continuous.
I have a 3300 that #5 & #6 cylinders run 310 and 320 F in cruise at 2700 ~ 2800 RPM. I have to pull back to 2450 to get them under
300 degrees.
Am I going to ruin my engine by cruising at 320 F. ??
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 222 hrs.
Do Not Archive
| Quote: |
ist">http://www.matronics.com/Navigator?JabiruEngine-List
ics.com
.matronics.com/contribution
|
This email is free from viruses and malware because avast! Antivirus protection is active. [quote][b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
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ftyoder(at)yoderbuilt.com
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| Posted: Mon Aug 25, 2014 7:59 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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Bobby,
Go to www.usjabiru.com select Tec. Support then Engine Tec Tips then Jabiru USA Tips on Airduct Instillation Scroll down to Jabiru Engine Cooling 101: Adjusting Your Installation. Cruise 2850 RPM 270F to 300F.
I hope this helps,
Tim
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Tim Yoder
Sent: Monday, August 25, 2014 7:34 AM
To: jabiruengine-list(at)matronics.com
Subject: RE: Re: JabiruEngine-List Digest: 2 Msgs - 08/23/14
Bobby,
I'll see if I can find the source and report. However, If your head bolts are passing the 20# torque test I wouldn't be concerned about the temps. If some of the bolts move I would try to improve the cooling to those heads.
Tim
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of BobbyPaulk(at)comcast.net
Sent: Monday, August 25, 2014 6:05 AM
To: Server, JabiruEngine-List Digest
Subject: Re: JabiruEngine-List Digest: 2 Msgs - 08/23/14
Tim,
Where did you get the information about 304 F. Maximum in cruise. I thought it was 356 F max continuous.
I have a 3300 that #5 & #6 cylinders run 310 and 320 F in cruise at 2700 ~ 2800 RPM. I have to pull back to 2450 to get them under
300 degrees.
Am I going to ruin my engine by cruising at 320 F. ??
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 222 hrs.
Do Not Archive
| Quote: |
ist">http://www.matronics.com/Navigator?JabiruEngine-List
ics.com
.matronics.com/contribution
|
This email is free from viruses and malware because avast! Antivirus protection is active.
| Quote: |
ist">http://www.matronics.com/Navigator?JabiruEngine-List
ics.com
.matronics.com/contribution
|
This email is free from viruses and malware because avast! Antivirus protection is active. [quote][b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
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UK Clive
Joined: 17 May 2013
Posts: 27
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| Posted: Mon Aug 25, 2014 8:40 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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JEM-0002-3 (12th May 2014) says 392F and 356F for Climb and cruise though the cooler the better of course!
Get the latest manuals from Jabiru Australia:
http://www.jabiru.net.au/manuals#engine-maintenance
Regards, Clive
On 25 Aug 2014, at 16:59, Tim Yoder <ftyoder(at)yoderbuilt.com (ftyoder(at)yoderbuilt.com)> wrote:
[quote] Bobby,
Go to www.usjabiru.com select Tec. Support then Engine Tec Tips then Jabiru USA Tips on Airduct Instillation Scroll down to Jabiru Engine Cooling 101: Adjusting Your Installation. Cruise 2850 RPM 270F to 300F.
I hope this helps,
Tim
From: owner-jabiruengine-list-server(at)matronics.com (owner-jabiruengine-list-server(at)matronics.com) [mailto:owner-jabiruengine-list-server(at)matronics.com (owner-jabiruengine-list-server(at)matronics.com)] On Behalf Of Tim Yoder
Sent: Monday, August 25, 2014 7:34 AM
To: jabiruengine-list(at)matronics.com (jabiruengine-list(at)matronics.com)
Subject: RE: Re: JabiruEngine-List Digest: 2 Msgs - 08/23/14
Bobby,
I'll see if I can find the source and report. However, If your head bolts are passing the 20# torque test I wouldn't be concerned about the temps. If some of the bolts move I would try to improve the cooling to those heads.
Tim
From: owner-jabiruengine-list-server(at)matronics.com (owner-jabiruengine-list-server(at)matronics.com) [mailto:owner-jabiruengine-list-server(at)matronics.com (owner-jabiruengine-list-server(at)matronics.com)] On Behalf Of BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)
Sent: Monday, August 25, 2014 6:05 AM
To: Server, JabiruEngine-List Digest
Subject: Re: JabiruEngine-List Digest: 2 Msgs - 08/23/14
Tim,
Where did you get the information about 304 F. Maximum in cruise. I thought it was 356 F max continuous.
I have a 3300 that #5 & #6 cylinders run 310 and 320 F in cruise at 2700 ~ 2800 RPM. I have to pull back to 2450 to get them under
300 degrees.
Am I going to ruin my engine by cruising at 320 F. ??
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 222 hrs.
Do Not Archive
This email is free from viruses and malware because avast! Antivirus protection is active.
This email is free from viruses and malware because avast! Antivirus protection is active.
[b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Mon Aug 25, 2014 9:23 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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Bobby:
I doubt it!
First - You have to see if your probes are reading correctly.. Do a calibration and side-by-side test of all the probes with a comparison to a lab grade standard thermometer. If you do not have access to such a unit I have found that the LASER Thermometers are very accurate.
Second - You have to know where the temperature reading were taken for the report.
Third - What is the +/- tolerance of the units used for the test... And what is it for the probes you are using?
Fourth - What can you do to lower your CHT's other than pulling back on power? How are your baffles? How big is your EXIT cowl area? Rule of thumb - The EXIT area should be TWICE the size of the Air Intake Area... Do the MATH! Use a ruller to obtain the correct sizes.
Barry
On Mon, Aug 25, 2014 at 9:04 AM, <BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)> wrote:
[quote]
Tim,
Where did you get the information about 304 F. Maximum in cruise. I thought it was 356 F max continuous.
I have a 3300 that #5 & #6 cylinders run 310 and 320 F in cruise at 2700 ~ 2800 RPM. I have to pull back to 2450 to get them under
300 degrees.
Am I going to ruin my engine by cruising at 320 F. ??
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 222 hrs.
Do Not Archive
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
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ftyoder(at)yoderbuilt.com
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| Posted: Mon Aug 25, 2014 9:54 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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Berry,
I have read (Tony Bengalis, I think) that the exit area should be three times the inlet. You are correct though, if you are running hot look for the well established solutions so you can comfortably run at normal cruise speeds. If your engine temps are ok and the cylinder head bolts don't move ay 20# your good to go.
My 3300 SN 346, solid lifter, thick fins so I am using the lower F numbers.
Tim
From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of FLYaDIVE
Sent: Monday, August 25, 2014 10:23 AM
To: jabiruengine-list(at)matronics.com
Subject: Re: Re: JabiruEngine-List Digest: 2 Msgs - 08/23/14
Bobby:
I doubt it!
First - You have to see if your probes are reading correctly... Do a calibration and side-by-side test of all the probes with a comparison to a lab grade standard thermometer. If you do not have access to such a unit I have found that the LASER Thermometers are very accurate.
Second - You have to know where the temperature reading were taken for the report.
Third - What is the +/- tolerance of the units used for the test... And what is it for the probes you are using?
Fourth - What can you do to lower your CHT's other than pulling back on power? How are your baffles? How big is your EXIT cowl area? Rule of thumb - The EXIT area should be TWICE the size of the Air Intake Area... Do the MATH! Use a ruller to obtain the correct sizes.
Barry
On Mon, Aug 25, 2014 at 9:04 AM, <BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)> wrote:
| Quote: |
Tim,
Where did you get the information about 304 F. Maximum in cruise. I thought it was 356 F max continuous.
I have a 3300 that #5 & #6 cylinders run 310 and 320 F in cruise at 2700 ~ 2800 RPM. I have to pull back to 2450 to get them under
300 degrees.
Am I going to ruin my engine by cruising at 320 F. ??
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 222 hrs.
Do Not Archive
| Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
ist">http://www.matronics.com/Navigator?JabiruEngine-List
ics.com
.matronics.com/contribution
|
This email is free from viruses and malware because avast! Antivirus protection is active. [quote][b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
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jwd3ca(at)gmail.com
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| Posted: Mon Aug 25, 2014 10:29 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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Adding an extra inch or two or three to the cowl exit area lip has been found to be effective in reducing overall temps. The extra lip helps increase the low pressure, essentially 'sucking' more air flow through the engine compartment. I fabricated a lip extension from .020 aluminum, rivited it on. Works like a charm. On 25 Aug 2014 13:25, "FLYaDIVE" <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:[quote] Bobby:
I doubt it! Â
First - You have to see if your probes are reading correctly... Â Do a calibration and side-by-side test of all the probes with a comparison to a lab grade standard thermometer. Â If you do not have access to such a unit I have found that the LASER Thermometers are very accurate. Â
Second - You have to know where the temperature reading were taken for the report.
Third - What is the +/- tolerance of the units used for the test... And what is it for the probes you are using?
Fourth - What can you do to lower your CHT's other than pulling back on power? Â How are your baffles? Â How big is your EXIT cowl area? Â Rule of thumb - The EXIT area should be TWICE the size of the Air Intake Area... Â Do the MATH! Â Use a ruller to obtain the correct sizes.
Barry
On Mon, Aug 25, 2014 at 9:04 AM, <BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)> wrote:
| Quote: |
Tim,
Where did you get the information about 304 F. Maximum in cruise. I thought it was 356 F max continuous.
I have a 3300 that #5 & #6 cylinders run 310 and 320 F in cruise at 2700 ~ 2800 RPM. I have to pull back to 2450 to get them under
300 degrees.
Am I going to ruin my engine by cruising at 320 F. ??
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 222 hrs.
Do Not Archive
ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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jerryvmd
Joined: 18 Apr 2008
Posts: 25
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| Posted: Mon Aug 25, 2014 10:56 am Post subject: JabiruEngine-List Digest: 2 Msgs - 08/23/14 |
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I fully agree. The most important factor to correct higher CHT is
OUTFLOW. Increase the opening in the bottom and add a larger lip to the
bottom curve. I duct taped mine on until I found the right size and
shape (stayed on with no problem as long as no oil on the fiberglass).
Once the correct size then permanently rivet - remember this is not a
structural piece so any rivets even hardware store will work. I few for
nearly 3 hours yesterday, temps near 80 and high humidity and a cloud
deck from 2500 to 5000 feet. I climbed to above the clouds in a
continuous climb and only one cylinder got to 230 but all temps returned
to 260-285 range once I lowered the noise to cruise and stayed there. I
have an older, early SSN solid lifter 3300 with nearly 400 hours.
On 8/25/2014 2:28 PM, j. davis wrote:
| Quote: |
Adding an extra inch or two or three to the cowl exit area lip has
been found to be effective in reducing overall temps. The extra lip
helps increase the low pressure, essentially 'sucking' more air flow
through the engine compartment. I fabricated a lip extension from .020
aluminum, rivited it on. Works like a charm.
|
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
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